Resistance unit



'(3. w. CAMP. RESISTANCE UNIT.

APPLICATION man rzs.2o.1911.

Patented Oct. 28,1919.

ATTUHNEYJ UNITED STATES PATENT oEEicE.

GEORGE WARREN CAMP, OF MOUNT VERNON, NEW YORK, ASSIGNOR TO WARD LEONARD ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

RESISTANCE UNIT.

Specification of Letters Patent...

Patented-Oct. 28, 1919.

Applicationled February 20, 1917. Serial No. 149,720.

To all whom 'it may concern.' l

Be it known that I, GEORGE W. CAMP, a citizen of the United States, residing at Mount Vernon, in the county of fW'estchester and State of New York,`have invented-- certain new and useful Improvements in Resistance Units, of which the following is a specification.

The principal objectof my invention is to provide a new and improved resistance unit of rugged and convenient design. Another object of my invention is'to provide a resistance unit adapted to have one end secured in ya convenient manner to a support with both terminals disposed at the other end. These objects and others will be made apparent in the following specification and claims taken in connection withthe accompanying drawings. In these drawings I have illustrated one specific embodiment of my invention, but it will be understood that the invention is defined in the appended claims.

Referring to the drawings, Figure 1 is ar perspective view o'f one of my improved resistance units mounted on a support. Fig.vr 2 is a section of the same. Fig. 3 is a top view of one unit/ Figs. 4, 5 Yand 6 are views of detail parts at certain stages in the manufacture and asmember 13-16 is made from a sheet metal' stampin as shown in Fig. 5, and this is finally s aped as shown in Fig. 6. Thus a projecting terminal lug 16 is provided conductively connected to the initial end of the 'resistance conductor 12, and firmly mounted on one-endof the tube 11. A'fter the resistance conductor. 12 is wound on the tube 11, the final end is attached by a clip 15 to a ,be seen that the lug stranded band 14', and a terminal member .16v has its groove 13 engaged under the yband 14', after which its ends are twisted together, similarly to 17 for band 14. The terminal member 16" can be adjusted around the tube 11 before the band 14 is fastened, so as to bring it in proper angular relation to the lug 16. By referring to Fig. 2, it will the tube 11 before the band 14 is fastened in place. l

The inner earthenware tube 18 has its outer face flattened on one sideto it against, the terminal member 16. This inner 4tube 18 ts snugly inside of the tube 11, and against member 16.

After the parts are assembled as just described, a coating of enamel 19, or other insulating adhesive material, is applied over all the parts except the interior of the tube 18 and the two projecting lugs 16 and 16. Thus the parts are all rigidly secured together and a simple conveniently shaped rugged resistance unit is provided with both its terminals exposed at one end extending radially at a convenient angle. This unit and others like it. may be supported on a bar 20 by means of `long screws 22, engaging the screw threaded holes 21 inthe bar 20. Under the head 24 o'f each screw 22 isa suitable cushion washer 23. The lugs 16 and 16 as shown in Fig. 1 may have conductors attached to them, so as to put the resistance wire 12 in series therewith. It will be noticed thateven if the bar 20 is of conductive material, thereneed be no conductive connection to it from the circuit of, the resistance ywire 12, for the screw 22 contacts only with the inner tube 18 which is of insulating material.` By bringing terminal member 16 from one end through the inside of tube 18 to the other end, both terminals are brought out at one end so that they can be conveniently lengaged by the conductors leading to the resistance unit.- The inner tube 18'holds the parts 4.firmly in a definite relation for enameling` and insures that no ordinary stresses to which the lugs 16 and 16 may be subjected can loosen them or Acrack the enamel. For certain 16 is passed through classes "of work it may be desirable to have i the two lugs 16 and 16 stand at a deinite as to bring the two terminals 16 and 16 vat the proper angular relation, without unduly 'altering the effective length of conductor 12 between the two clips 15 and 15.

I claim 1. In, combinati-on, a tube of insul-ating material, a resistance conductor wound thereon, a termin-al member from one end of vvthe resistance conductor through the inside of thetube, and an inner tube of insulgting material, said terminal member lying out- (side the inner tube.

2. In combination, a tube of. insulating material, a resistance conductor wound thereon, two. conductive bands one around each end of the tube with the respective ends of the resistance conductor attached thereto,

and two terminal members connected to the respective bands, one such member being longer than the other and extending through the inside of the tube and projecting from lthe other end thereof.

- 3. In combination, a tube of insulating material, a resistance conductor wound thereon, two conductive bands one around each end of the tube with the respective ends of the resistance conductor attached thereto, and two terminal members connected to the respective bands, one such member being longer thanthe other and extending through the inside of the tube, the ends of both said members projecting radially from the same end of the tube and' at a definite angle with.

one another. l

4. In combination, a tube of insulat' `material, a resistance conductor -woun thereon, a terminal member from one end of the resistance conductor through the inside of the tube, 'an inner tube of insulating material, said terminal member .l the inner tube, a support for the oregoing assembled elements and a screw throughther inner'tuzbe engaging said sup-port.

5. In combination, a tube of insulatin material, a resistance conductor woun thereon, a terminal member from one end of the resistance conductor through the inside y of the tube, a support for the oregoing -assembled elements, a screw through said tube engaging said support and means within said tube insulating the screw from the said terminal member.

6. In combination, a `tube or insulating material, a resistancef conductor Wound thereon, a terminal member'fromone end of the resistance conductor through thel inside of the tube, means within said tube bracing said terminal member and a coating o enamel over the tube and the resistance con- I bands, a support for the foregoing assembled elements and a screw through said tube engaging said support, said lugs standing in definite angular relation to said support ir respective of the angular relation of the points of attachment of the ends of the resistance conductor with said bands.

9. In combination, a drum of insulating material, a resistance wire of definite len h wound thereon, two bands around respective ends of the drum, clips fastening the ends of the resistance wire to said bands', and two radial terminal lugs bound under the bands at a desired denite angular relation to each other irrespective of the angular relation of the ends of the resist-ance wire.

10. In combination, a drum of insulating material, a resistance wire wound thereon, a stranded band around one end of the' drum, a clip pinching one end of the resist-` 'ance wire securely to said band, .a terminal member having a groove engaged by said' band a lug projecting radially therefrom at any desired angular sition, the ends of said band being twiste -tightly togethe'r and thereby securing the said terminal member firmly on the drum.

11. T-he method of asseinblingand securing aresistance wire, on a drum to form a resistance unit, -which consists in fastening the initial end of said wire to a band at one en-d of the drum,'binding a terminal lug drum, securing itsfinalend to another band at'the other end lof the drum, placing anunder said band, Winding the wire on the i other terminal lug under thel last mentioned band at denite angular relation to the rst lug, and fastening the said'last mentioned' band in lace.

12. In bcombln-ation an insulatin tube having a resistive conductor wound t ereon,

a hollow insulator placed therein, a conduc tor attached at one end of seid resistive conductor and running the length of the tube und between the tube and the insulator, and an adhesive insulating coating which fastens the tube and the insulator together.

18. In combination, a, tube of insulating material, a resistance conductor Wound thereon, a termmal member extending radially from one, end of the resistanoe concluetorat one end of said. tube, and anothery terminal 'member from the other end of said resistance conductor at the other end of said tube extending through the inside of the tube and bent and. continued radially therefrom.

' GEORGE WARRENCAMP.

A a'v 

